<template>
	<view>
		<view class="search-box">
			<!-- 使用 uni-ui 提供的搜索组件 -->
			<uni-search-bar @input="input" :focus="true" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		<!-- 搜素结果列表 -->
		<view class="sugg-list" v-if="searchResults.length > 0">
		  <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
		    <view class="goods-name">{{item.goods_name}}</view>
		    <uni-icons type="arrowright" size="16"></uni-icons>
		  </view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
		  <!-- 标题区域 -->
		  <view class="history-title">
		    <text>搜索历史</text>
		    <uni-icons type="trash" size="17" @click="clearHistory"></uni-icons>
		  </view>
		  <!-- 列表区域 -->
		  <view class="history-list">
		    <uni-tag :text="item" v-for="(item, i) in historyList" :key="i" @click="gotoGoodsList(item)"></uni-tag>
		  </view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				keywords: '',
				// 定义搜索结果
				searchResults: [],
				// 搜索关键词历史
				historyList: ['apple', 'huawei', 'xiaomi']
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('history') || '[]')
		},
		methods: {
			input(value) {
				clearTimeout(this.timer)
				this.timer = setTimeout(async () => {
					// 基于 value 值进行搜索
					// console.log(value)
					// todo: 基于关键词，调接口获取搜索结果
					this.keywords = value
					await this.getSearchResult()
					// 保存搜索关键词
					this.saveSearchHistory()
				}, 500)
			},
			async getSearchResult() {
				// 判断关键词是否为空
				if (this.keywords === '') {
					this.searchResults = []
					return
				}
				// 发起请求，获取搜索建议列表
				const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.keywords })
				if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				// console.log(this.searchResults)
			},
			gotoDetail(id) {
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + id
				})
			},
			// 保存搜索词
			saveSearchHistory() {
				// 将当前搜索词，填入搜索历史数组中
				this.historyList.unshift(this.keywords)
				// 数组去重之后，重新转为数组
				// this.historyList = [...new Set(this.historyList)]
				this.historyList = Array.from(new Set(this.historyList))
				uni.setStorageSync('history', JSON.stringify(this.historyList))
			},
			// 点击跳转到商品列表页面
			gotoGoodsList(kw) {
			  uni.navigateTo({
			    url: '/subpkg/goods_list/goods_list?query=' + kw
			  })
			},
			// 清空历史记录
			clearHistory() {
				this.historyList = []
				uni.setStorageSync('history', '')
			}
		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 999;
	}

	.uni-searchbar {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		position: relative;
		padding: 16rpx;
		/* 将默认的 #FFFFFF 改为 #C00000 */
		background-color: #c00000;
	}
	
	.sugg-list {
	  padding: 0 5px;
	
	  .sugg-item {
	    font-size: 12px;
	    padding: 13px 0;
	    border-bottom: 1px solid #efefef;
	    display: flex;
	    align-items: center;
	    justify-content: space-between;
	
	    .goods-name {
	      // 文字不允许换行（单行文本）
	      white-space: nowrap;
	      // 溢出部分隐藏
	      overflow: hidden;
	      // 文本溢出后，使用 ... 代替
	      text-overflow: ellipsis;
	      margin-right: 3px;
	    }
	  }
	}
	
	.history-box {
	  padding: 0 5px;
	
	  .history-title {
	    display: flex;
	    justify-content: space-between;
	    align-items: center;
	    height: 40px;
	    font-size: 13px;
	    border-bottom: 1px solid #efefef;
	  }
	
	  .history-list {
	    display: flex;
	    flex-wrap: wrap;
	
	    .uni-tag {
	      margin-top: 5px;
	      margin-right: 5px;
	    }
	  }
	}
</style>